OSG Screw Thread Insert STI Tap: Spiral Fute, 1/4"-28 UNF, H3 / 2B-3B

An OSG Screw Thread Insert STI Tap is used to cut internal threads in steel and stainless steel for installing helical wire thread inserts. It is commonly applied in aerospace, automotive, and industrial maintenance to repair or reinforce stripped threads without replacing the parent component.

The OSG STI Tap 1714401 has a thread size of 1/4"-28 UNF, a spiral-flute design for chip evacuation, and 3 flutes. It is ground to H3 / 2B-3B tolerance class, making it suitable for producing threads that accept standard STI inserts in steel and stainless steel workpieces.

You can source the OSG STI Tap 1714401 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we supply genuine OSG tooling to procurement teams and maintenance shops globally.

To select the correct OSG STI tap, match the thread size and pitch (e.g., 1/4"-28 UNF) to the insert you plan to install. Use a spiral-flute tap for steel and stainless steel to clear chips. Verify the tap tolerance (H3 / 2B-3B) aligns with your required thread class. Always follow the insert manufacturer's recommended drill size.